Tunable solid-state fluorescent materials for supramolecular encryption

Hou, X. L.; Ke, Chenfeng; Bruns, Carson J.; McGonigal, Paul R.; Pettman, Roger B.; Stoddart, J. Fraser

doi:10.1038/ncomms7884

Cited by 396 publications

(258 citation statements)

References 51 publications

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“…[14,16,18,[20][21][22] To control visible color, swelling agents such as solvents [17] and ionic liquids [6,23] are usually employed and the soft BCP ordered gel is responsive to either solvent quality [24] or crosslinking of the polymer chains in the swellable microdomain. [25][26][27][28][29] Localizing and spatially addressing a reversible external stimulus to write/erase the SC in a BCP-based PC using an ink-jet printer would enable production of low cost, Rewritable displays. [25][26][27][28][29] Localizing and spatially addressing a reversible external stimulus to write/erase the SC in a BCP-based PC using an ink-jet printer would enable production of low cost, Rewritable displays.…”

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confidence: 99%

Printable and Rewritable Full Block Copolymer Structural Color

et al. 2017

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Structural colors (SCs) of photonic crystals (PCs) arise from selective constructive interference of incident light. Here, an ink-jet printable and rewritable block copolymer (BCP) SC display is demonstrated, which can be quickly written and erased over 50 times with resolution nearly equivalent to that obtained with a commercial office ink-jet printer. Moreover, the writing process employs an easily modified printer for position- and concentration-controlled deposition of a single, colorless, water-based ink containing a reversible crosslinking agent, ammonium persulfate. Deposition of the ink onto a self-assembled BCP PC film comprising a 1D stack of alternating layers enables differential swelling of the written BCP film and produces a full-colored SC display of characters and images. Furthermore, the information can be readily erased and the system can be reset by application of hydrogen bromide. Subsequently, new information can be rewritten, resulting in a chemically rewritable BCP SC display.

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Printable and Rewritable Full Block Copolymer Structural Color

et al. 2017

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“…Carbon dots being easier to synthesize, highly fluorescent, with low cost and low toxicity are the latest edition in this list. But these carbon dots also have shortcomings as the code written by these materials may be visible by naked eye under ambient light3031 or the excitation of UV light3233. Therefore code written using materials having more confidentiality will be of much demand.…”

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confidence: 99%

On-line Ammonia Sensor and Invisible Security Ink by Fluorescent Zwitterionic Spirocyclic Meisenheimer Complex

Das

Pramanik

Haldar

2017

Sci Rep

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Ammonia is not only a highly important gas for civilization but also contribute significantly for climate change and human health hazard. Highly sensitive ammonia sensor has been developed from a fluorescent zwitterionic spirocyclic Meisenheimer complex. Moreover, formation of this Meisenheimer complex can also be utilized for selective as well as naked eye instant detection of nitro aromatic explosive picric acid. The presence of a quaternary nitrogen atom directly attached to the spiro carbon is the unique feature of this Meisenheimer complex. This excellent photoluminescent (PL) Meisenheimer complex has two distinct stimuli responsive sites. One is sensitive towards acid while the other one is towards the base. These two positions can be modulated by adding one equivalent acid and one equivalent base to result two new products which are non fluorescent. One of these two non fluorescent species was found very exciting because of its UV/Vis transparency. Utilizing this concept we have fabricated an on-line sensor for measuring ammonia in dry or humid and condensing sewer air. The sensor was robust against ambient temperature and humidity variation. We have also developed an invisible ink from this Meisenheimer complex, with potential application for security purpose.

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“…Hou et al 11 used consumer-grade thermal inkjet printers to dispense tunable solid-state uorescent materials for supramolecular encryption, enabling encryption of graphical information that can be easily veried upon application of an appropriate authentication reagent. The described procedure is protected from counterfeiting and reverse engineering, and shows the use of uorescent inks in various concentrations, that are tuned beforehand.…”

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confidence: 99%

Accessing individual 75-micron diameter nozzles of a desktop inkjet printer to dispense picoliter droplets on demand

et al. 2018

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Desktop inkjet printers are ubiquitous and relatively inexpensive among the variety of available printers.These inkjet printers use an array of micro fluidic pumps, nozzles based on piezoelectric actuation, to dispense individual picoliter volume ink droplets at high speed. In this paper, we show that individual pumps in desktop printers can be accessed to dispense droplets on demand. Access was obtained using the printer's command language programming. A detailed description of the access procedure is discussed. Droplets were printed on a paper as it rolled underneath the printhead, and with a minor hardware modification, they were also printed on a glass substrate. With this access, individual droplets were deposited, the smallest having an average diameter of 62 mm with a standard deviation of 6.9 mm, with a volume of $4 pL. From the intended position, the droplets had a standard deviation of 5.4 mm and 8.4 mm in the vertical and horizontal directions, respectively. The ink droplets were dispensed at a rate of 7.1 kHz. A circularity factor of 0.86 was obtained indicating that the dispensed droplets are of good quality. By replacing the ink in the cartridges with liquids of choice (e.g. cells, proteins, nanoparticles etc.), we believe it provides an opportunity for low-cost, high-speed, high-precision, picoliter volume printing for a variety of applications.

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Tunable solid-state fluorescent materials for supramolecular encryption

Cited by 396 publications

References 51 publications

Printable and Rewritable Full Block Copolymer Structural Color

Printable and Rewritable Full Block Copolymer Structural Color

On-line Ammonia Sensor and Invisible Security Ink by Fluorescent Zwitterionic Spirocyclic Meisenheimer Complex

Accessing individual 75-micron diameter nozzles of a desktop inkjet printer to dispense picoliter droplets on demand

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